Hi Mark, re-fitting used rings to a new or different cylinder surface is not recommended practice. I've only tried it once myself, on a Honda GXV120, and it failed miserably. I'd fitted new rings to a worn bore, and they'd bedded in nicely, but after 8 hours running I scrapped the block and put the parts (including the piston and rings) into a better one. The engine immediately had substantial blow-by, and it didn't get better. After a couple of hours' running, I fitted new rings and immediately, all was well. I've often put used rings back into their original bore of course, and had no problems, but I can't say I recommend putting them into a different bore, or a newly-honed bore.
